Guide to Selecting & Installing, Solid Vinyl Windows

Guide to Buying & Installing Solid Vinyl Windows
SIDING VINYL - separate article
VINYL / PVC WINDOW WARPING - separate article
VINYL Siding or PLASTIC Window ODORS in Buildings - separate article
VINYL CHLORIDE HEALTH INFO - separate article
Questions & answers aboutsolid vinyl windows & vinyl clad windows: choices, installation, troubleshooting, repair
References

Click to Show or Hide Related Topics

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Solid vinyl windows, guide: this article explains the properties of solid vinyl windows, vinyl window choices, and how to install and maintain vinyl windows. In this article series we discuss the selection and installation of solid vinyl windows and doors, following best construction and design practices for building lighting and ventilation, with attention to the impact on building heating and cooling costs, indoor air quality, and comfort of occupants. We review the proper installation details for windows and doors, and we compare the durability of different window and door materials and types.

Guide to Buying & Installing Solid Vinyl Windows

This article includes excerpts or adaptations from Best Practices Guide to Residential Construction, by Steven Bliss, courtesy of Wiley & Sons.

Also see VINYL / PVC WINDOW WARPING, and see WINDOWS & DOORS our home page for window and door information, and also see WINDOW TYPES - Photo Guide for a photographic guide to window and door types and architectural styles. Ourlinks listed at Related Topics provide in-depth articles on window and door selection, inspection, installation, problem diagnosis, and repair.

Solid vinyl windows can attribute their surge in popularity over the past decade to the fact that they have delivered a high-quality, maintenance-free product for about a third less cost than a clad window of comparable quality.

Contractors like the fact that the interior window sashes do not need painting, and homeowners like the notion that the frame and sill cannot rot (although vinyl windows do not live forever).

Solid vinyl windows have shed their image as cheap plastic replacement windows by continually improving to the point where premium quality vinyl windows are stronger and more dimensionally stable, more fade resistant, and better looking with crisper extrusions and better hardware (Figure 3-4).

As an added benefit, vinyl window manufacturers claim that their products can match the energy performance of wood windows.

While improvements in extrusions have made vinyl windows less bulky looking, they still do not have the crisp lines of a wood window, particularly on the interior, and vinyl window sash are unmistakably white plastic.

Still, vinyl windows have shed their stigma as a low-end product and are finding their way into more and more new homes across the spectrum from spec to upper-end custom.

Construction of Solid Vinyl Windows

Vinyl window quality starts with the chemistry.

\A number of additives are blended into the raw vinyl to make it more dimensionally stable and more resistant to UV radiation, which otherwise can cause the vinyl to fade, chalk, and become brittle over time.

The vinyl is then extruded into long sections with multiple internal chambers that give the material its rigidity and insulation value from the trapped air (see Figure 3-5 at left).

The thin-walled plastic ranges in thickness from about .065 to .085 inch. All other things being equal, the thicker the plastic, the stronger the window component. However, extrusions can gain strength from having a well-engineered profile, as well (many European windows use much heavier .125-inch plastic, but U.S. manufacturers feel this would make them less competitive).

The extrusions are then cut and joined to create frames and sash. Nowadays, most corners are heat-welded, producing the strongest joints, although some corners are still mechanically fastened. Some manufacturers add steel or aluminum reinforcing, particularly to larger windows, to stiffen them and help them meet structural load requirements. Typical places for reinforcing are sills, which have a tendency to sag in hot weather, lock rails, and mullions between mulled units.

Vinyl Window Options

All vinyl windows have an integral nailing flange, simplifying watertight installations (see Window Flashing & Sealing Guide).

All standard window types, including tilt-turn, are available in solid vinyl today. All glazing types, except for true divided lites, are also available.

For the look of divided lites, the options are either snap-in grilles or between-the-glass grills.

Typical exterior trims include brickmold or nominal 4-inch flat casings with either an integral or snap-on J-channel to receive the ends of wood, vinyl, or fiber cement siding.

Window trims designed for stucco are widely available in the western states and Florida. Colors are generally limited to white and beige, since dark colors absorb heat and raise vinyl temperatures to near 165°F, where it begins to soften and sag.

On the interior, most vinyl windows will accept either wood extension jambs or drywall returns.

A solid vinyl replacement window may not be so easy to spot during a building survey, as our photo (above left) illustrates. The replacement window is coverd by an aluminum storm and screen window, aluminum covered trim, etc.

Quality Issues with Vinyl Windows

As with any building products, not all vinyl windows are created equal. Many early models were poorly made and subject to excessive thermal movement, often opening at corners, fading prematurely, and losing structural integrity from UV exposure, particularly in hot climates.

Warping was a complaint for some PVC vinyl windows, as we discuss at VINYL / PVC WINDOW WARPING.

Most window manufacturers today have overcome these problems with better vinyl formulations, improved extrusion design, and heat welding at corners. Many also use metal reinforcing at strategic points, such as meeting rails, sills of large units, and between mulled units.

Since the chemistry, extrusion design, metal reinforcing, and other determinants of quality are hidden from view, however, the best approach is to stick with an established manufacturer and to look for a certification label from the American Architectural Manufacturers Association (AAMA).

AAMA established a separate standard for vinyl windows in 1997, which includes tests for strength, dimensional stability, strength of corner welds, heat and impact resistance, and weathering. The main features to look for include:

Heat-welded corners
Metal reinforcing, particularly on larger units
Solid, heavy extrusions with little obvious flex
Good quality hardware

Installation Procedure for Vinyl Windows

As reported in Best Practices Guide to Residential Construction Chapter 3, BEST PRACTICES GUIDE: WINDOWS & DOORS:

High Rate of Thermal Expansion in Vinyl Windows, allow for

In general, vinyl windows install the same as other flange-type windows, although the installer must take into account vinyl’s high rate of thermal expansion.

A 6-foot-wide window can expand as much as 5/16 inch from 0°F to 100°F. To prevent problems, It is best to leave a 1/8 - to 1/4 -inch gap between the window and siding or wood trim (more in cold weather, less in hot). Good detailing of this joint is especially important with stucco, which can crack if set too tightly against the window or leak if the caulk joint fails.

Thermal expansion can also cause window sash to bind in hot weather if the rough opening is too small to accommodate the movement. And in very cold weather, some vinyl windows can bow inward due to temperature differences on either side of the window.

Sturdy extrusion profiles with metal reinforcing can help prevent this. A related concern is sagging of the sill during hot weather— vinyl starts to soften and distort at about 165°F, a temperature easily reached on the surface of a dark building in direct sun. To prevent sagging, some manufacturers reinforce the sill, and all recommend specific shim spacing under the sill.

Some vinyl window installations require continuous support along the length of the sill, which is easiest to achieve by using a double 2x sill with leveling shims in between.

Vinyl Window Installation Nailing Recommendations

Nailing recommendations for vinyl windows also vary among manufacturers. Some recommend driving nails tight; some suggest leaving the nail heads proud. Some recommend against nailing the head flange or corners; others require it. To avoid warranty problems, it is always best to closely follow the manufacturer’s instructions regarding the rough opening, shimming, nailing, and other installation details. Other general recommendations that apply to all windows include:

In hot weather, do not store vinyl windows in a container, such as a trailer, or lean them against a wall, as they can permanently deform.
Seal around openings with flexible flashing before installing the window (see Window Flashing & Sealing Guide).
Set the nailing fin in a bead of high-quality caulking.
Before nailing, make sure the side jambs are plumb and do not bow in or out in the center. Some installers use a wood spacer to hold the two side jambs parallel.
Do not puncture the nailing fin when installing trim or siding.
Do not use expanding foam to seal around the window frame on the interior.

Also see WINDOW TYPES - Photo Guide.

Industry Associations for Windows & Doors

American Architectural Manufacturers Association (AAMA) www.aamanet.org

Efficient Windows Collaborative www.efficientwindows.org

National Fenestration Rating Council (NFRC) www.nfrc.org Sustainable by Design www.susdesign.com

Shareware calculators for sun angles, solar heat gain, and shading

Window and Door Manufacturers Association (WDMA) www.wdma.com

-- Adapted and paraphrased, edited, and supplemented, with permission from Best Practices Guide to Residential Construction.

Frequently Asked Questions (FAQs)

...

Ask a Question or Search InspectApedia

Questions & answers or comments about solid vinyl windows & vinyl clad windows: choices, installation, troubleshooting, repair

Ask a Question or Enter Search Terms in the InspectApedia search box just below.

Technical Reviewers & References

Related Topics, found near the top of this page suggest articles closely related to this one.

Basic Housing Inspection, US DHEW, S 352.75 U48, p.144, out of print, but is available in most state libraries; New York State version, ca 1955, source of our window parts and window repair sketches.
Best Practices Guide to Residential Construction, by Steven Bliss. John Wiley & Sons, 2006. ISBN-10: 0471648361, ISBN-13: 978-0471648369, Hardcover: 320 pages, available from Amazon.com and also Wiley.com. See our book review of this publication.
Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. (416) 964-9415 1-800-268-7070 info@carsondunlop.com. The firm provides professional home inspection services & home inspection education & publications. Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides:
- Commercial Building Inspection Courses - protocol ASTM Standard E 2018-08 for Property Condition Assessments
- Home Inspection Education Courses including home study & live classes at eleven colleges & universities.
- Home Inspection Education Home Study Courses - ASHI@Home Training 10-course program.
  Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on these courses: Enter INSPECTAHITP in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
- The Home Reference Book, a reference & inspection report product for building owners & inspectors.
  Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
- The Home Reference eBook, an electronic version for PCs, the iPad, iPhone, & Android smart phones.
  Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. Enter inspectaehrb in the order payment page "Promo/Redemption" space.
- The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors.
  Special Offer: For a 5% discount on any number of copies of the Illustrated Home purchased as a single order Enter INSPECTAILL in the order payment page "Promo/Redemption" space.
- The Horizon Software System manages business operations,scheduling, & inspection report writing using Carson Dunlop's knowledge base & color images. The Horizon system runs on always-available cloud-based software for office computers, laptops, tablets, iPad, Android, & other smartphones.

Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair

Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Also see our Book Reviews - InspectAPedia.

The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.

Or choose the The Home Reference eBook for PCs, Macs, Kindle, iPad, iPhone, or Android Smart Phones. Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. Enter INSPECTAEHRB in the order payment page "Promo/Redemption" space.

Building inspection education & report writing systems from Carson, Dunlop & Associates Ltd


	InspectAPedia^®	InspectAPedia
	Free Encyclopedia of Building & Environmental Inspection, Testing, Diagnosis, Repair	Ask a Question or Search InspectAPedia

Free Encyclopedia of Building & Environmental Inspection, Testing, Diagnosis, Repair

Ask a Question or Search InspectAPedia

Guide to Selecting & Installing, Solid Vinyl Windows (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();